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. 2017 Jun 13;22(6):980. doi: 10.3390/molecules22060980

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 33 — trans-AB Porphyrins bearing swallowtail phosphonate motifs, as described by the group of Lindsey [131,132].